MIL-P-24475 (SHIPS)
3 .2.2.8 When motor driven pumps of the close-coupled type are specified, bedplates
will not be required, except as otherwise specified (see 6.1). Each pump shall be provided
with a support for bolting to the foundation to augment the support from the motor frame.
3.2.2.9 Vertical pumps shall be base mounted or center of gravity mounted. The base
and support bracket shall have provisions for bolting to foundation. Pumps which are
resiliently mounted shall be supported as close to the center of gravity as practical.
3.2.2.10 Special attention shall be given the design of close-coupled type pumps
to insure that leakage from the pump shaft seal cannot enter motor frames or bearing brackets.
3.2.2.11 Eyebolts, lugs, holes, or other means suitable shall be provided to permit
attachment of lifting gear for lifting the assembled pump, driver and attached accessories
as a complete unit. Means shall be provided for the handling of parts and components,
weighing 150 pounds and over, which cannot be handled manually during unit overhauls and
preventive maintenance examinations.
3.2.3 Bearings.
3.2.3.1 Types.
3.2.3.1.1
Radial and thrust bearings shall be rolling contact type.
3.2.3.1.2 Rolling contact bearings shall be in accordance with FF-B-171, FF-B-185 or
FF-B-187. Rolling contact bearings shall be selected to result in a minimum B-10 life of
10,000 hours, calculated in accordance with FF-B-171, FF-B-185 and FF-B-187.
3.2.3.1.3 Rolling contact bearings Specially selected for quiet operation in accordance
with MIL-B-17931 shall be used for pumps where required to meet special noise requirements.
3.2.3.1.4 Rolling contact bearing lubrication method shall prevent bearing failure
resulting from over greasing.
3.2.3.1.5 Rolling contact bearings having a DN value in excess of 200,000 shall be oil
lubricated unless the vendor can demonstrate to the command or agency concerned that the
specific grease lubricated bearing application has been proven in previous Navy shipboard
service.
Where :
D = Diameter of bearing bore in millimeters
N . RPM
3.2.3.2
Installation.
3.2.3.2.1 Bearings shall be installed an housings separated by suitable seals for
adequate protection from gland leakage. In vertical, rigidly coupled pumps contact bearings,
where used, shall be installed external to the pump between the coupling and gland seal.
Means shall be provided to prevent escape of lubricant around the shaft. All baffles,
wipers and related parts shall be readily renewable.
3.2.3.2.2 Bearing housings shall be cast integral with the bracket or secured thereto
in such a manner as to insure alignment. Bearing housings to bracket seats shall be machined
such that the precision of bearing alignment is insured
3.2.3.3 Thrust bearings.
3. 2.3.3.1 A thrust bearing shall be installed on pump or motor (if applicable) for
counteracting any unbalanced hydraulic or mechanical thrust in either direction. In this
connection consideration shall be given to the fact that rolling, pitching or list of a
ship at sea may introduce thrust loads even though the unit is in hydraulic balance.
3. 2.3.3.2 Thrust bearings may be of the combined radial and thrust rolling contact
type.
3.2.3.3.3 Combined radial and thrust bearings shall be type 134 in accordance with
FF-B-171.
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